Well, that's obvious, isn't it? I'd ask him an engaging question, and when answering his reaction time will increase tenfold and I'll make my move. Depending on what firepower he has, I should have a decent chance, and if I fail, at least I'm not going to die talking, but acting.
The sick gunman would turn around in anticipation of witnessing a goat battering a chicken's behind, 'stallion on stallion' action and the farmer showing the stableboy just how much he's appreciated.
As he's turning I'll perform a spinning kick to his face, knock him down and pick up the whilst saying ''Well, well, well... now who's in the sh*t?'' I'd ridicoule and humiliate him by telling him I'll let him live for longer if he wears make-up and fists himself. If he looked like he was enjoying it it'd shoot him regardless.